What is the main idea of the passage？
A. Mammoths can talk with scientists nowadays.
B. Scientists completed mammoth clone last week.
C. Scientists made speculation of cloning mammoths.
D. We should protect mammoths for they will extinct soon.
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What does the last sentence in the first paragraph imply？
A. The rich men lost their free life in order to own their possession for ever.
B. The rich men has sold their perishable goods in order to buy some other goods.
C. The rich man lost their freedom because they had become slaves.
D. It is false to sell some possession in order to buy some other things.
The word "defrosting" in the third paragraph most probably means
A. becoming unfrozen
B. analyzing
C. researching
D. discovering
According to the speaker, how should most of the notes be taken？
A. In shorthand.
B. In short phrases.
C. In the student's own words.
D. In direct quotation.
According to the passage, Diogenes ______.
A. led a miserable life in Corinth
B. gave his students lessons in certain places.
C. was a capable playwright and poet
D. enjoyed making a living like a dog
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